Sewing-machine



(No Model.) 1

L. L. RICHMOND.

SEWING MACHINE. No. 251,638.

Patented Dec. 27,1881.

Inventor.- o oacls' 0C. @Z mfl Ates': f 44 F WWW wzmmflw/L I UNITEDSTATES PATENT OFFICE.

LOUIS L. RICHMOND, OF ST. LOUIS, MISSOURI.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 251,638, dated December27, 1881. Application filed October 4 1881. (No model.)

To all whom itmay concern Be it known that I, LOUIS L. RICHMOND, of St.Louis, Missouri, have. made a new and useful Improvement inSewing-Machines, of which a sewingmachine with which the improvement inquestion is immediately connected; Fig. 2,

a view in perspective, showing the outer end of the overhanging arm andparts therewith connected; Fig. 3, a view in perspective of theneedle-bar cranks and parts immediately therewith connected; Fig, 4, asideelevation of the outer end of the shaft that works in theoverhanging arm, and showing the collars and cranks thereon in section;and Fig. 5, a section taken on the line a: not Fig. 4. The same lettersdenote the same parts.

The present invention is an improvementin sewing machines working twoneedles. As such machines have hitherto been constructed the twoneedle-bars and needles always work together. When one needle-bar andneedle is in operation the other needle-bar and needle must also be inoperation, and when one stops the other must stop. It is sometimesdesirable in such machines-for instance, in turning a corner-to operatebut one needle at a. time; and to provide for this is the aim of thisinvention, which consists'in the means used in transmitting the motionof the driving-shaft in the overhanging arm to the needle-bars.

The improvement is adaptable to varioussewing-machines; It isillustrated in connec-' tion with a McKay machine, A being the head,

having the overhanging arm a; B, the main driving-shaft; G, the shaft inthe overhanging arm; D D, the frames upon the outer end of theoverhanging arm; E E, the needle-bars,

and F F the cranks connected withthe shaft 0 and operating the bars E E,respectively, all p of the usual form saving as modified by the presentimprovement. In place, however, of

attaching the cranks FF directly and rigidly to the shaft 0, asheretofore, they are held loosely uponcollars G G, which,'in turn, are

. can thus be stopped at will.

arms gg'.- The cranks F F are also furnished with arms f f. v

The machine being in motion, the collars G G and arms g g constantlyoscillate with the shaft 0. The cranks F F, however, being loose uponthe collars,do not oscillate with the latter, and the needle bars willnot be moved until the cranks F F are fastened to, the collars. This isaccomplished conveniently by locking the arms 9 g and the arms ff,respectively, together and this, in turn, is preferably effected bymeans of the latches f f which are pivoted to the arms ff, respectively,at f, and which, when desired, can be turned to engage in the slots g 9respectively, of the arms 9 9. When thus engaged the cranks, collars,

and shaft 0 oscillate together, and the needlebars are driven in theusual manner.

The motion of either one or both of the needle bars For instance,if itis desired to operate the needle-bar E only, the arms f and g areinterlocked by 'means of the latch f as shown in Fig. 2. The arms f gand crank F and collar G now move together, causing the needle-bar E tomove in the usual manner. The bar E from .the arms f 9, notbeing'inter1ocked,does not move. When it is desired to use the lastnamed bar, E, the parts are arranged as in Fig. 3 and to work both barsthe'two sets,fg and f g, of arms are interlocked.

To prevent the cranks F F from being accidentally moved by reason of thefriction of the parts, the latches ff are suitably shaped and extendedto pass, when turned on the pivotsf", around and be held by the stops HH upon theframes D D, as seen in Fig. 2.

The shaft'G and frame D can be adjusted in the usual manner, so as tobring the needlebars nearer to or farther from eachother.

I claim- 1'. The combination, in a sewing-machine, of theshaft 0, thecollar G, having the arm 9, and-the crankF, having the arm f, and latchf substantially as described.

' 2. *The combination of the shaft 0, the collars G G, having the armsgg, and the cranks "F. F, having the arms ff and latches f f,substantially as described. p

3. The combinationof the frame D, the stop Il,the shaft 0, the collarG,the arm guthe latch a lateral extension fastened thereto, and the noand the crank F, substantially as described, cr'mik 1*, said crank beingloose upon said shaft, and for the purpose set, forth. andmechanism,substantially as describedfior 4. The combination of the shaft0., the crank locking said crank to said lateral extension at; 5 F, andthe collar G, said collar being fastened a point at the side of saidshaft.

to said shaft, and said collar and crank being L. L. R[GHMOND1. capableof being interlocked, when desired, for Witnesses: the purpose set fort!CHAS. D. MOODY,

5. The combination of the shaft- O, having 'luos. L. JONES.

